Joseph  mccon-nb-ll



@geiten tetrs @anni @Hita JOSEPH MCC()NNFILL, F T01/VA CITY, IOWA. iLetters .Patent No. 69,232, dated September 24, 1867.

IMPRVEMENT IN VALVES FOR STEAM ENGINES.

4TG ALL WHOM 1T MAY CONOERN:

Be it known that I, JOSEPH MCCONNELL, of Iowa City, in the county ofJohnson, and State of Iowa, have invented a new and useful Improvementin Steam Engines; and I do hereby declare that the following is a i'ull,clear, and exact description thereof, -which will enable those skilledin the art to make and use the same, reference being had to theaccompanying drawings, forming partei' this specification.

.This invention relates to a new and improved valve motion in the steamengine, the principal novelty of which consistsin opening and closingthe ports of lthe engine cylinder by operating two cylinder valves ateach i end of the engine cylinder, (one within the othcr) the innervalve being a cut-od` valve; and the invention con sists in the mannerin which these-valves are arranged and operated, and in the device forrendering the inner valve a variable cut-oil, controlled by the speed ofthe 'engine through the governor, as will hereinafter bc described. I

Figure 1 represents a side view of the engine, showing the steam-chestsat each end of the cylinder, and thc arrangement for operating thecnt-oil" valve. i

Figure 2 is a plan or top view of the same, showing the main shaf't, theeccentrics, and their rods, attached to the cranks of the oscillatingvalve stems. i

Figure 3 is a vertical section of iig. 2 through the line :r af.

Figure 4 is a vertical section of fig. -3 through the line y y.

Figure 5 is another vertical section of lig. Zthrough a' fr.

Similar letters of reference indicate corresponding parts.

A represents the engine cylinder, B the main shaft, C thc piston, and Dthe piston-rod; E is the pitman, which is connected with the cross-headD', and with the flywheel B ofthe main shaft; FF are the eecentrics onthe maiushaft, and G Gr are the eccentric-rods.

There is no particular novelty in thc engine or the parts connected withit, so far as we have lettered the i same.l The main features of theimprovement and invention, as before stated, consist in theconstruction,

arrangement, and operatiouof the valves, which we will now proceed todescribe. r H H are the steam-chests, cylindrical in form, and situatedat each end ofthe cylinder, and, as seen in the drawing, they are placedat right angles or transversely to the cylinder. Within cach of thesesteam-chests there is a cylinder oscillating valve, the stems of whichare seen in tig. 2, mark-ed J J2 Each stem has a short crank, it, withwrist-s, and they are both operated by the eccentric F and rod G bybeing connected together by the rod c. These valves are open at theiropposite ends and on their sides, as seen the drawing, figs. 3 and 5.These arethe main steam-valves, each having a slot aperture opposite theopen part. They are marked n 1t. The slot apertures, as the valves arerolled or cscillatcd, admit steanr to the cylinder and exhaust ittherefrom in a manner similar to the ordinary rolling valve. The steamisexhausted into an oriice which is cast in the cylinder, seen at o, iig.el, which orifice communicates with a chamber in the bed-plate oi theengine, as seen at m. The course of the exhaust steam is indicated bythe arrow in tig. 3. The cutoli` valves are placed within thesteam-valves n, where they arc oscillatcd, thc same as thc steam-valvesare in the steam-chest. In the figs. 3 and 5 the ends of these cut-oil"valves-arc secu, marked p. They also have stems and cranks, which areseen in figs. l and Q. The stems are marked 7'; the cranks arc marked s.These valves are escillated by the eccen tric F and rod G', attached toa rock-shaft, T. This rock-shaft passes transversely over the enginecylinder, and has on its end a slotted arm, u, a side view ci' which issoon in iig. 1. et' are connecting links, which are l loosely attachedto the cranks c by'screw-bolts, and which have wrist-pins :t on theirinner ends, the collars of which are inside of the links l'. Between thepins the collars are flattened, so that they will enter the slots on thearms u, as seen in iig. 1. This slotted arm u, being attached to therock-shaft T, which is operated by tlieleccentric F, operates thecut-ofir valves p p. The amount of steam which these valves cut oil" orlet on depends upon the extent of their oscillating movement or throw,and the throw, of course, depends upon length of the f cranks s, and theposition of wrist-pins :c in the slots of the arm u. The position of thepins x in the slots may hc controlled by the governor of the' engine,the rod of which may be connected with the pins a' by a suitable bridle,(seen-in red,) whereby the pins can be slipped up and down in the slotsas the balls of the governor rise y or fall by the variations of thespeed of the engine. It is thus made a self-adjusting variable cut-oit.The steam pipe fr m the boiler is connected with the pipe 71 at il.There are heads on the ends ofthe steam-chests,

through which the valve-rods pass, marked o. There may be smiling-boxesattached to these heads, by which the valve-stems may be packedsteam-tight. The rock-shaft T is supported on standsf; :is seen in fig.3. The slotted ami u is fastened to the rock-shaft by o. set-screw, orin any suitable manner.

Having thus described my invention, what I claim, end desire to 'secureby Letters Patent, is-

l. ,The combination :ind arrangement of the erm u, secured to the end ofthe rock-shaft T, between the cylinders H, and in the slots of whichtlic'wrisbpins x work, connecting the erm u to the valves p,tlie'position of said pins x in the slots being controlled by means ofAthe governor, whereby the throw of the valves p is regulated, :1shcrci'n shown and described.

2. The valves j), constructed as described, formed in n. sernicrcle,wtlithe pressure of steam applied upon one side, as and for the purposespecified.

3. The arrangement of the cylinders H,1nain valves und cuboff valves p,transverse shaft T, slotted arm u.,

- connecting-arms o, and cranks 8, as and for tbc purpose speeiiied,

JOSEPH MCCONNELL. Witnesses:

T. W. ROGERS, Puno HAYNns.

